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node_modules/lottie-web/player/js/utils/asset_loader.js

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+const assetLoader = (function () {
+  function formatResponse(xhr) {
+    // using typeof doubles the time of execution of this method,
+    // so if available, it's better to use the header to validate the type
+    var contentTypeHeader = xhr.getResponseHeader('content-type');
+    if (contentTypeHeader && xhr.responseType === 'json' && contentTypeHeader.indexOf('json') !== -1) {
+      return xhr.response;
+    }
+    if (xhr.response && typeof xhr.response === 'object') {
+      return xhr.response;
+    } if (xhr.response && typeof xhr.response === 'string') {
+      return JSON.parse(xhr.response);
+    } if (xhr.responseText) {
+      return JSON.parse(xhr.responseText);
+    }
+    return null;
+  }
+
+  function loadAsset(path, callback, errorCallback) {
+    var response;
+    var xhr = new XMLHttpRequest();
+    // set responseType after calling open or IE will break.
+    try {
+      // This crashes on Android WebView prior to KitKat
+      xhr.responseType = 'json';
+    } catch (err) {} // eslint-disable-line no-empty
+    xhr.onreadystatechange = function () {
+      if (xhr.readyState === 4) {
+        if (xhr.status === 200) {
+          response = formatResponse(xhr);
+          callback(response);
+        } else {
+          try {
+            response = formatResponse(xhr);
+            callback(response);
+          } catch (err) {
+            if (errorCallback) {
+              errorCallback(err);
+            }
+          }
+        }
+      }
+    };
+    // Hack to workaround banner validation
+    xhr.open(['G', 'E', 'T'].join(''), path, true);
+    xhr.send();
+  }
+  return {
+    load: loadAsset,
+  };
+}());
+
+export default assetLoader;